/*
* @Author: wanghongfucoder
* @Date:   2017-03-16 09:37:16
* @Last Modified by:   wanghongfucoder
* @Last Modified time: 2017-03-16 09:38:59
*/

public  class Demo {
	public static void main(String[] args) {
		User robert=new User("robert");
		User john=new User("robert");
		robert.sendMessage("Hi John");
		john.sendMessage("Hello robert");
	}
}